[PATCH net-next 1/3] net: phy: mscc: add support for RGMII MAC mode

[Antoine Tenart <antoine.tenart@bootlin.com>]

This patch adds support for connecting VSC8584 PHYs to the MAC using
RGMII.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
---
 drivers/net/phy/mscc.c | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/drivers/net/phy/mscc.c b/drivers/net/phy/mscc.c
index d24577de0775..ecb45c43e5ed 100644
--- a/drivers/net/phy/mscc.c
+++ b/drivers/net/phy/mscc.c
@@ -272,6 +272,7 @@ enum macsec_bank {
 #define MAC_CFG_MASK			  0xc000
 #define MAC_CFG_SGMII			  0x0000
 #define MAC_CFG_QSGMII			  0x4000
+#define MAC_CFG_RGMII			  0x8000
 
 /* Test page Registers */
 #define MSCC_PHY_TEST_PAGE_5		  5
@@ -2751,27 +2752,35 @@ static int vsc8584_config_init(struct phy_device *phydev)
 
 	val = phy_base_read(phydev, MSCC_PHY_MAC_CFG_FASTLINK);
 	val &= ~MAC_CFG_MASK;
-	if (phydev->interface == PHY_INTERFACE_MODE_QSGMII)
+	if (phydev->interface == PHY_INTERFACE_MODE_QSGMII) {
 		val |= MAC_CFG_QSGMII;
-	else
+	} else if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
 		val |= MAC_CFG_SGMII;
+	} else if (phy_interface_mode_is_rgmii(phydev->interface)) {
+		val |= MAC_CFG_RGMII;
+	} else {
+		ret = -EINVAL;
+		goto err;
+	}
 
 	ret = phy_base_write(phydev, MSCC_PHY_MAC_CFG_FASTLINK, val);
 	if (ret)
 		goto err;
 
-	val = PROC_CMD_MCB_ACCESS_MAC_CONF | PROC_CMD_RST_CONF_PORT |
-		PROC_CMD_READ_MOD_WRITE_PORT;
-	if (phydev->interface == PHY_INTERFACE_MODE_QSGMII)
-		val |= PROC_CMD_QSGMII_MAC;
-	else
-		val |= PROC_CMD_SGMII_MAC;
+	if (!phy_interface_mode_is_rgmii(phydev->interface)) {
+		val = PROC_CMD_MCB_ACCESS_MAC_CONF | PROC_CMD_RST_CONF_PORT |
+		      PROC_CMD_READ_MOD_WRITE_PORT;
+		if (phydev->interface == PHY_INTERFACE_MODE_QSGMII)
+			val |= PROC_CMD_QSGMII_MAC;
+		else
+			val |= PROC_CMD_SGMII_MAC;
 
-	ret = vsc8584_cmd(phydev, val);
-	if (ret)
-		goto err;
+		ret = vsc8584_cmd(phydev, val);
+		if (ret)
+			goto err;
 
-	usleep_range(10000, 20000);
+		usleep_range(10000, 20000);
+	}
 
 	/* Disable SerDes for 100Base-FX */
 	ret = vsc8584_cmd(phydev, PROC_CMD_FIBER_MEDIA_CONF |
-- 
2.24.1